Photo: Mariah Carey, Nick Cannon Debut ‘Dem Babies’

Six months after their twins were born, music superstar Mariah Carey and actor-comedian Nick Cannon are ready to show “dem babies” off to the world. Carey and Cannon, married since 2008, introduced the babies to Barbara Walters in an exclusive interview airing on “20/20? Friday at 10 p.m. ET.